Verse from Hebrews

弟兄们，你们要小心，免得你们中间有人存着邪恶、不信的心，以致离弃了永活的神；(希伯来书 3:12)

See to it, brothers and sisters, that none of you has a sinful, unbelieving heart that turns away from the living God. (Hebrews 3:12)

 We are to exhort one another to resist the hardening of our hearts that comes with sin.